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DTC codes / P09xx · Transmission / P0987

P0987Transmission Fluid Pressure Sensor/Switch 'E' Circuit

P0987 indicates that the transmission control module (TCM) has detected an abnormal electrical condition on the circuit for transmission fluid pressure sensor or switch 'E'. This sensor monitors hydraulic pressure inside the transmission, and the code sets when the signal voltage falls outside the expected range for the current operating conditions.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaTransmission

Symptoms you may notice

  • Illumination of the check engine light or transmission warning light
  • Harsh or delayed gear shifts
  • Transmission stuck in a single gear (limp mode)
  • Slipping or flaring during acceleration
  • Often no symptoms besides the warning light

Common causes, most likely first

  1. Faulty transmission fluid pressure sensor/switch 'E'
  2. Damaged or corroded wiring or connector at the sensor
  3. Open or short circuit in the sensor signal or ground circuit
  4. Low transmission fluid level or contaminated fluid
  5. Internal transmission hydraulic issues affecting pressure
  6. Faulty transmission control module (TCM) or software glitch

How to diagnose and fix it

  1. Check transmission fluid level and condition; top off or replace if necessary
  2. Inspect the sensor and its connector for damage, corrosion, or loose pins
  3. Perform a visual inspection of the wiring harness for chafing or breaks
  4. Use a scan tool to monitor live pressure sensor data and compare to specifications
  5. Test the sensor circuit with a multimeter for continuity and short circuits
  6. Replace the transmission fluid pressure sensor/switch 'E' if faulty
  7. Repair or replace damaged wiring or connectors as needed

Diagnosing P0987 Beyond the Sensor

  • A low transmission fluid level or degraded fluid can cause pressure readings to fall outside the expected range, triggering P0987 even when the sensor itself is healthy.
  • Corroded or loose pins in the sensor connector are a frequent cause that is often overlooked during diagnosis.
  • The code can be set by a momentary electrical glitch, so clearing it and test-driving may confirm whether the fault is intermittent.
  • Always verify the TCM has the latest software calibration, as some manufacturers have released updates to correct false pressure sensor codes.

Can I keep driving with P0987?

If the vehicle is in limp mode or shifting harshly, avoid driving at high speeds or under heavy load and seek service soon. Continuing to drive with erratic pressure readings can lead to further transmission damage.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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